public TraficLight()
{
underlying = new Timer(TimeSpan.FromSeconds(5));
LightColor = Color.Red;
underlying.AddEvent(() =>
{
if (LightColor == Color.Red)
{
LightColor = Color.Green;
}
else if (LightColor == Color.Green)
{
LightColor = Color.Yellow;
}
else
{
LightColor = Color.Red;
}
if (LightChanged != null)
{
LightChanged.Invoke(this, EventArgs.Empty);
}
});
underlying.Start();
}
/// <summary>
/// begins as if was in durationGreen state initially
///
/// this method is += subscribed to the Timer's published ⚡ Elapsed event
/// (internally in the same class scope that Timer is declared)
/// </summary>
void OnPulseTickEvent(object source, ElapsedEventArgs e)
{
_secondsElapsedInCycle += 1;
//todo: proper state machine that correctly separates four states for three colors...
//right now is weak design, as relies on symmetry between this function on SetNextLightColor();
//check if light changes
if ((Light == ConsoleColor.Green && _secondsElapsedInCycle == _durationGreen) ||
(Light == ConsoleColor.DarkYellow && _secondsElapsedInCycle == _durationAmber) ||
(Light == ConsoleColor.Red && _secondsElapsedInCycle == _durationRedAll + _durationRedJustThis))
{
//switch
_secondsElapsedInCycle = 0;
SetNextLightColor();
Console.ForegroundColor = Light;
Console.WriteLine($"current light color is ... {Light}");
// I wanna publish or emit or raise an event here... hmm...
// so how about ... this!
LightChanged?.Invoke(Light);
}
}
/// <summary>
/// Invoke listeners
/// </summary>
/// <param name="sender"> Initializer of event </param>
/// <param name="eventArgs"> Event arguments </param>
protected virtual void OnLightChange(object sender, LightArgs eventArgs)
{
LightChanged?.Invoke(sender, eventArgs);
}
//Grobal private void LightChagne(object sender, RoutedEventArgs e) => LightChanged?.Invoke(null, null);